I think the fear is how privacy laws and concerns will adapt to the increasing use of voice recognition capability in everyday items -- specifically when paired with 4G or other wireless capabilities. I know Sony got blasted recently for the fact that it was in the User Agreement for televisions with voice recognition programming that the data captured by the device was being saved on company servers and analyzed for possible targeted marketing.
And I believe Matel was under fire as well for similar privacy concerns with a wireless capable, voice activated Barbie.
So, as an innovation, the technology the cube represents could be interesting. But it's a double-edged sword when the immediate next question has to be, 'what's the cube doing with the voice data after it receives it'? 'Where is that data saved?' 'Is it retained?' and 'Who is listening?'
Pair that with the recent news reports on how people hack baby monitors and web cams in children's rooms... Privacy nightmare fuel ensues.
...so yeah, I'm going with I'm terrified of this. Not for what it can do, but the potential for abuse.